98 Prof. V. B. Lewes. [Feb. 1, 



Analysis of the Ethylene used in these experiments. 



Carbon dioxide Nil 



Oxygen 0'24 



Ethylene 98'55 



Nitrogen 1-21 



Methane Nil 



Hydrogen Nil 



100-00 



Table II. The Action of Heat upon Ethylene flowing at the rate of 

 4'2 c.c. per minute through 6 in. of heated tube. 



I. Analysis of heated gas made with paraffin absorption and explosion. 



Temperature of 



gas in tube 



Unsaturated 



hydrocarbons . . . 

 Saturated hydro- 

 carbons 



By paraffin 



By explosion. . . . 



Hydrogen 



Carbon monoxide . 

 Carbon dioxide . . . 



800 C. 

 91-90 



1-63 

 0-60 



23 



3-26 



1-11 



nil 



900 C. 

 84-31 



48 



5-001 R . 



1-48/ 6 ' 



4-67 



1-40 



nil 



1000 C. 

 46-31 



6-71 

 23-40 



j 30 -11 



19-65 

 1-23 

 nil 



1200 C. 

 18-31 



4-661 

 24-01J 



28-57 



49-51 

 1-10 

 nil 



II. Analysis of heated gas made without paraffin absorption. 



Unsaturated 

 hydrocarbons . . . 



Methane calcu- 

 lated from COj. . 



Carbon monoxide . 



Calculated from 

 Analysis II 



Found .......... 



Carbon deposited 

 in tube, grams 

 per 100 c.c. of 



92-0 



4-1 

 1-2 



84-15 



10-26 

 1-50 



45-72 



34-11 

 1-28 



III. Carbon dioxide from total explosion. 



Oil formed per 100 

 c.c ............. 



Vol. of gas before 

 heating ........ 



Vol. of gas after 

 heating ........ 



189-3 

 190-0 



trace 



0-012 

 521-7 

 469-1 



180-7 

 182-4 



trace 



lost 



129-2 

 133-4 



0-0101 

 -0573 



514 



460 



18-20 



28-79 

 1-0 



69-31 

 69-00 



0-2150 

 0-0035 



350 



470 



These experiments show conclusively that when only flowing slowly 

 through the tube a higher member of the paraffin group, probably 

 ethane, is formed up to 900 C., whilst at 1000 C. the quantity has 



